Optically anisotropic film, circularly polarizing plate, and display device

Abstract

The present invention provides an optically anisotropic film exhibiting excellent reciprocal wavelength dispersion, a circularly polarizing plate, and a display device. The optically anisotropic film of an embodiment of the present invention is an optically anisotropic film formed from a composition including a liquid crystal compound and an infrared absorbing dye, in which the optically anisotropic film satisfies a relationship of Formula (A): Re(450)/Re(550)<1, and an absorption at a wavelength of 700 to 900 nm in the fast axis direction of the optically anisotropic film is larger than an absorption at a wavelength of 700 to 900 nm in the slow axis direction of the optically anisotropic film. In Formula (A), Re(450) represents an in-plane retardation of the optically anisotropic film at a wavelength of 450 nm and Re(550) represents an in-plane retardation of the optically anisotropic film at a wavelength of 550 nm.

What is claimed is: 
     
         1 . An optically anisotropic film formed from a composition including a liquid crystal compound and an infrared absorbing dye,
 wherein the optically anisotropic film satisfies a relationship of Formula (A), and   an absorption at a wavelength of 700 to 900 nm in the fast axis direction of the optically anisotropic film is larger than an absorption at a wavelength of 700 to 900 nm in the slow axis direction of the optically anisotropic film,
   Re(450)/Re(550)<1  Formula (A)
 
   in the formula, Re(450) represents an in-plane retardation of the optically anisotropic film at a wavelength of 450 nm and Re(550) represents an in-plane retardation of the optically anisotropic film at a wavelength of 550 nm.   
     
     
         2 . The optically anisotropic film according to  claim 1 ,
 wherein an orientational order parameter S 0  of the optically anisotropic film at a maximum absorption wavelength in a wavelength range of 700 to 900 nm of the infrared absorbing dye satisfies a relationship of Formula (B),
   −0.50< S   0 <−0.15.  Formula (B)
 
   
     
     
         3 . An optically anisotropic film formed from a composition including a liquid crystal compound and an infrared absorbing dye,
 wherein an orientational order parameter S 0  of the optically anisotropic film at a maximum absorption wavelength in a wavelength range of 700 to 900 nm of the infrared absorbing dye satisfies a relationship of Formula (B), and   an absorption at a wavelength of 700 to 900 nm in the fast axis direction of the optically anisotropic film is larger than an absorption at a wavelength of 700 to 900 nm in the slow axis direction of the optically anisotropic film,
   −0.50< S   0 <−0.15.  Formula (B)
 
   
     
     
         4 . The optically anisotropic film according to  claim 1 ,
 wherein an integrated value of the absorbances in a wavelength range of 700 to 900 nm of the infrared absorbing dye is larger than an integrated value of the absorbances in a wavelength range of 400 to 700 nm of the infrared absorbing dye.   
     
     
         5 . The optically anisotropic film according to  claim 1 ,
 wherein the infrared absorbing dye is a compound represented by Formula (1),   
       
         
           
           
               
               
           
         
         in the formula, R 11  and R 12  each independently represent a hydrogen atom or a substituent, at least one thereof is an electron-withdrawing group, R 11  and R 12  may be bonded to each other to form a ring, R 13 's each independently represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substitutional boron, or a metal atom, or may be covalently bonded or bed coordinately bonded with R 11 , and R 14 's each independently represent a group having a mesogenic group. 
       
     
     
         6 . The optically anisotropic film according to  claim 1 ,
 wherein an in-plane retardation at a wavelength of 550 nm is 110 to 160 nm.   
     
     
         7 . A circularly polarizing plate comprising:
 the optically anisotropic film according to  claim 6 ; and   a polarizer.   
     
     
         8 . A display device comprising:
 a display element; and   the circularly polarizing plate according to  claim 7 , arranged on the display element.   
     
     
         9 . The optically anisotropic film according to  claim 2 ,
 wherein an integrated value of the absorbances in a wavelength range of 700 to 900 nm of the infrared absorbing dye is larger than an integrated value of the absorbances in a wavelength range of 400 to 700 nm of the infrared absorbing dye.   
     
     
         10 . The optically anisotropic film according to  claim 3 ,
 wherein an integrated value of the absorbances in a wavelength range of 700 to 900 nm of the infrared absorbing dye is larger than an integrated value of the absorbances in a wavelength range of 400 to 700 nm of the infrared absorbing dye.   
     
     
         11 . The optically anisotropic film according to  claim 2 ,
 wherein the infrared absorbing dye is a compound represented by Formula (1),   
       
         
           
           
               
               
           
         
         in the formula, R 11  and R 12  each independently represent a hydrogen atom or a substituent, at least one thereof is an electron-withdrawing group, R 11  and R 12  may be bonded to each other to form a ring, R 13 's each independently represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substitutional boron, or a metal atom, or may be covalently bonded or bed coordinately bonded with R 11 , and R 14 's each independently represent a group having a mesogenic group. 
       
     
     
         12 . The optically anisotropic film according to  claim 3 ,
 wherein the infrared absorbing dye is a compound represented by Formula (1),   
       
         
           
           
               
               
           
         
         in the formula, R 11  and R 12  each independently represent a hydrogen atom or a substituent, at least one thereof is an electron-withdrawing group, R 11  and R 12  may be bonded to each other to form a ring, R 13 's each independently represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substitutional boron, or a metal atom, or may be covalently bonded or bed coordinately bonded with R 11 , and R 14 's each independently represent a group having a mesogenic group. 
       
     
     
         13 . The optically anisotropic film according to  claim 4 ,
 wherein the infrared absorbing dye is a compound represented by Formula (1),   
       
         
           
           
               
               
           
         
         in the formula, R 11  and R 12  each independently represent a hydrogen atom or a substituent, at least one thereof is an electron-withdrawing group, R 11  and R 12  may be bonded to each other to form a ring, R 13 's each independently represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substitutional boron, or a metal atom, or may be covalently bonded or bed coordinately bonded with R 11 , and R 14 's each independently represent a group having a mesogenic group. 
       
     
     
         14 . The optically anisotropic film according to  claim 2 ,
 wherein an in-plane retardation at a wavelength of 550 nm is 110 to 160 nm.   
     
     
         15 . The optically anisotropic film according to  claim 3 ,
 wherein an in-plane retardation at a wavelength of 550 nm is 110 to 160 nm.   
     
     
         16 . The optically anisotropic film according to  claim 4 ,
 wherein an in-plane retardation at a wavelength of 550 nm is 110 to 160 nm.   
     
     
         17 . The optically anisotropic film according to  claim 5 ,
 wherein an in-plane retardation at a wavelength of 550 nm is 110 to 160 nm.